Optimizations of stacking sequence and number of plies for laminated cylinders using GA with intron genes

A new intron method is proposed to optimize stacking sequences and number of plies of composites. The intron method is developed from the recessive-gene-like repair method that is employed for implementation of stacking-sequence constraints without causing decrease of the design reliability of GA. The intron method is attempted for the optimizations of laminated cylinders to maximize the buckling load and minimize the number of plies. As a result, the intron method successfully obtained the real optimal stacking sequences and the number of plies without decrease of design reliabilities.